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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Another GUI-input speed observation:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>If you click the scroll wheel once to shift the text contents of the pane, the visual effect is very fast. I cannot detect any latency; it certainly is not close to what I see for text insertion/deletion, cursoring, and double-click selection. The slower operations all involve getting a damage rect at a specific point based on cursor position or click position. The faster scrolling function doesn’t need to do that. It just grabs the entire visible rectangle minus one line, and blits it shifted down by one line, along with the one new line. That looks like an almost zero-cost collection of damage rects. It’s a simple, fast calculation. Collection of damage rects for the slower operations looks much more expensive. The events involved in both cases are delivered to the target handler with the same latency. The slowness or quickness seems to have after that.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Shaping<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-left:1.0in'> Hence graphics output necessarily lags input on Morphic. So these speed differences have nothing to do with vm performance and everything to do with GUI architecture.<o:p></o:p></p><div><p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79'>Both Squeak and Pharo show the same delay for text selection latency. The architecture difference is not likely causing that. </span><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-left:.5in'>Given that both Pharo and Squeak useorphic and hence nothing have the same tender-in-step architecture isn’t the fact that they show the sane performance issue evidence that points to precisely this being the cause?<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Yes, but not architecture, by which I think you mean the pushing of events versus the fixed-frequency regular loop in Morphic. I would expect a big variation in the Morphic case, but I don’t know what the fixed frequency is; it could well under the noise floor. My first thought would be that getting the damage rects is the problem, but I’ve not seen the code.<o:p></o:p></span></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> <span style='color:#1F4E79'>How do we index or look up the word rectangle to render? I’m think that is more likely the cause. Is a map created at method compile time and updated after text is moved during edits?</span></span><o:p></o:p></p></div></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-left:.5in'>My understanding is that damage rectangles are retrieved,<span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Right, but this is the potentially slow part—the retrieving or perhaps more specifically mapping a point to a rectangle containing a contiguous sequence of non-whitespace character (a word).<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'>combined to produce a smaller (non-overlapping?) set, and that the entire morph tree is asked to render within these damage rectangles. You can read the gods for yourself.<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>It’ll be a while.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>….<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>I just tried some new experiments. I should have thought of these earlier. Character insertion and cursoring in any direction by one character have the same latency. Collecting the damage rectangle at the cursor position and around the selected word are both taking about the same time as far as I can tell with my eye, and this time is longer than in VW or any Windows app. But VW doesn’t use the Windows message queue directly. All incoming Windows events are converted to Smalltalk equivalents and are queued on the Smalltalk side. And it works well. Why not mimic that pattern to get the extra speed? Does something in Squeak/Pharo architecture prevent us from doing that? <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>How do we set a multi-process time profiler running so that we don’t need to eval blocks to get tallies. I just want to use the editor and watch method hit distribution. I see the Time profiler window; it seems to need a code snippet to work.</span><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p></o:p></span></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:.5in;margin-bottom:5.0pt;margin-left:0in'><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79'>How is the JIT code cache cleared?</span><o:p></o:p></p></div></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-left:.5in'>Dialect dependent. In Squeak/Pharo/Cuis IIRC Smalltalk voidCogVMState. <o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Okay.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'> Can’t remember how it’s done in VW.<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>CompiledMethod allInstancesWeakly do: [:compiledMethod | compiledMethod flushCachedVMCode]</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79'>Baseline state: the only thing that comes to mind here is Collect All Garbage.</span><o:p></o:p></p></div></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-left:.5in'>There’s also Smalltalk garbageCollectMost which just runs a scavenge. IIRC someInstance has a side effect of running a scavenge in VW.<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Okay.<o:p></o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>and then ensure, through the relevant introspection primitives, <o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79'>What are these? What state features am I introspecting after the test? Sizes of heap subspaces? I can do Time microsecondsToRun: on the blocks.</span><o:p></o:p></p></div></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>In Squeak/Pharo/Cuis see Smalltalk vmParameterAt: or Smalltalk vm parameterAt: and senders.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Okay. I see this list:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>parameterAt: parameterIndex<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> "parameterIndex is a positive integer corresponding to one of the VM's internal<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> parameter/metric registers. Answer with the current value of that register.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Fail if parameterIndex has no corresponding register.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> VM parameters are numbered as follows:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 1 end (v3)/size(Spur) of old-space (0-based, read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 2 end (v3)/size(Spur) of young/new-space (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 3 end (v3)/size(Spur) of heap (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 4 nil (was allocationCount (read-only))<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 5 nil (was allocations between GCs (read-write)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 6 survivor count tenuring threshold (read-write)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 7 full GCs since startup (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 8 total milliseconds in full GCs since startup (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 9 incremental GCs (SqueakV3) or scavenges (Spur) since startup (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 10 total milliseconds in incremental GCs (SqueakV3) or scavenges (Spur) since startup (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 11 tenures of surving objects since startup (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 12-20 were specific to ikp's JITTER VM, now 12-19 are open for use<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 20 utc microseconds at VM start-up (actually at time initialization, which precedes image load).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 21 root table size (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 22 root table overflows since startup (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 23 bytes of extra memory to reserve for VM buffers, plugins, etc (stored<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> in image file header).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 24 memory threshold above which shrinking object memory (rw)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 25 memory headroom when growing object memory (rw)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 26 interruptChecksEveryNms - force an ioProcessEvents every N milliseconds (rw) 27 number of times mark loop iterated for current IGC/FGC (read-only) includes ALL marking<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 28 number of times sweep loop iterated for current IGC/FGC (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 29 number of times make forward loop iterated for current IGC/FGC (read-only) 30 number of times compact move loop iterated for current IGC/FGC (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 31 number of grow memory requests (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 32 number of shrink memory requests (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 33 number of root table entries used for current IGC/FGC (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 34 number of allocations done before current IGC/FGC (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 35 number of survivor objects after current IGC/FGC (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 36 millisecond clock when current IGC/FGC completed (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 37 number of marked objects for Roots of the world, not including Root Table entries for current IGC/FGC (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 38 milliseconds taken by current IGC (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 39 Number of finalization signals for Weak Objects pending when current IGC/FGC completed (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 40 BytesPerOop for this image<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 41 imageFormatVersion for the VM<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 42 number of stack pages in use<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 43 desired number of stack pages (stored in image file header, max 65535)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 44 size of eden, in bytes<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 45 desired size of eden, in bytes (stored in image file header)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 46 machine code zone size, in bytes (Cog only; otherwise nil)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 47 desired machine code zone size (stored in image file header; Cog only; otherwise nil)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 48 various header flags. See getCogVMFlags.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 49 max size the image promises to grow the external semaphore table to (0 sets to default, which is 256 as of writing)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 50-51 nil; reserved for VM parameters that persist in the image (such as eden above)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 52 root table capacity<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 53 number of segments (Spur only; otherwise nil)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 54 total size of free old space (Spur only, otherwise nil)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 55 ratio of growth and image size at or above which a GC will be performed post scavenge<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 56 number of process switches since startup (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 57 number of ioProcessEvents calls since startup (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 58 number of ForceInterruptCheck calls since startup (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 59 number of check event calls since startup (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 60 number of stack page overflows since startup (read-only)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 61 number of stack page divorces since startup (read-only) 62 compiled code compactions since startup (read-only; Cog only; otherwise nil)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 63 total milliseconds in compiled code compactions since startup (read-only; Cog only; otherwise nil)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 64 the number of methods that currently have jitted machine-code<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 65 whether the VM supports a certain feature, MULTIPLE_BYTECODE_SETS is bit 0, IMMTABILITY is bit 1<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 66 the byte size of a stack page<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 67 the max allowed size of old space (Spur only; nil otherwise; 0 implies no limit except that of the underlying platform)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 68 the average number of live stack pages when scanned by GC (at scavenge/gc/become et al)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 69 the maximum number of live stack pages when scanned by GC (at scavenge/gc/become et al)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 70 the vmProxyMajorVersion (the interpreterProxy VM_MAJOR_VERSION)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> 71 the vmProxyMinorVersion (the interpreterProxy VM_MINOR_VERSION)"<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Shaping<o:p></o:p></span></p></div><div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p></div></div></blockquote></div></div></body></html>